IEEE 802.11e WLAN에서 QoS 지원을 위한 적응적 stepping backoff 방법에 관한 연구 = Adaptive stepping backoff scheme for QoS in IEEE 802.11e WLAN

다국어 초록 (Multilingual Abstract)

This paper describes an adaptive service differentiation scheme for QoS enhancement in IEEE 802.11 wireless ad-hoc networks. Our approach, called Adaptive Stepping Backoff scheme, is derived from the new EDCF introduced in the upcoming IEEE 802.11e standard. Adaptive Stepping Backoff scheme controls the backoff procedure taking into accounts both applications requirements and network conditions. During the high load condition, this scheme makes another random time for the load and tries to avoid the collision with this time. We evaluate through simulations the performance of the Adaptive Stepping Backoff scheme and compare it with the EDCF scheme proposed in the 802.11e and Adaptive EDCF scheme proposed by Lamia Romdhani. Results show that Adaptive Backoff scheme outperforms the basic EDCF, especially at high traffic load conditions.

목차 (Table of Contents)

• 1. 서 론 = 1
• 2. IEEE 802.11 MAC = 3
• 3. IEEE 802.11의 QoS를 개선한 방법들 = 6
• 4. 적응적 Stepping Backoff 방법 = 11
• 4.1. 방법의 개요 = 11
• 4.2. 네트워크 상태 판단 = 11
• 4.3. 적응적 Stepping Backoff 방법 = 12
• 5. 시뮬레이션 = 21
• 5.1. 시뮬레이션 파라미터 선택 = 21
• 5.2. 시뮬레이션용 네트워크 파라미터들 = 25
• 5.3. 시뮬레이션 방법 = 25
• 5.4. 시뮬레이션 결과 = 27
• 6. 결론 = 33
• 7. 참고 문서 = 34
• Abstract = 37